It depends on what you want to do. Do you want to backup your images and share it with friends and family, or get critique from other photographers.

IMO Flickr is the best for the second purpose, but you can see only 200 photos, if you don't have a Pro account.
If its storage you are looking for, there are other sites that provide a lot of storage. I don't recollect the names. No idea about photobucket as I dont use it.

and not even on this voting poll
My vote is for picasa, you can even upload photo directly from tour hard disk to it by just right clicking on it, i think it's the best option if you dwnld it's software.

For me Picasa web albums works out best when used along with the Picasa program. The resizing can be specified during the upload process. At 800X600 {Which is the size that I upload } I am not likely to run out of time any time soon. And there is nothing to stop you from getting another google account if you run of of space

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